# 定义一个空列表变量
# 向列表内添加5,9,13这三个数字
list = []
list.append(5)
list.append(9)
list.append(13)
print(list)


# ["张飞","刘备","关羽","刘邦","刘老二","曹操"]
# 把”刘老二”修改为”周瑜”
list2 =["张飞","刘备","关羽","刘邦","刘老二","曹操"]
list2[4] = "周瑜"
print(list2)